2In 3-quart saucepan, heat water, butter, 1 teaspoon salt, the onion and oregano to boiling. Remove from heat. Stir in milk and dry potatoes just until moistened. Let stand about 30 seconds or until liquid is absorbed; whip with fork until fluffy. Spread half of the potato mixture in baking dish. Layer with beef and half of the tomatoes. Top with remaining potatoes and tomatoes; sprinkle with cheese.

3Bake uncovered about 30 minutes or until hot and bubbly.

Expert Tips

Always read labels to make sure each recipe ingredient is gluten free. Products and ingredient sources can change.

Oregano means "joy of the mountain" in Greek, and the herb would be sorely missed in pizza or other Italian dishes.

Power up this casserole with bulk Italian sausage instead of ground beef.